Quote:
Originally Posted by
unclesam099 
I recently purchased a (I believe) 1950s US Navy Peacoat in 42L. The fit seems to be HUGE compared to what I've heard about sizing for a vintage peacoat. Does anyone else have a 40 that they might measure for me? I may have to try to sell my 42 and get a ~40R
Thanks.
A size 42 vintage issue peacoat should measure about 22.25" or 22.50" pit to pit. A size 40 should measure about 21.25" or 21.50. They are made so there is enough room underneath for a sweater and still have ease of movement.
If you want a fitted peacoat, without room for a sweater, then buy a size smaller than your chest measurement. If your
actual chest measurement is 42", then a size 40 vintage peacoat should give a relatively close fit--assuming you are of normal proportions and not in a skinny 17 or 18 year old body.
See the section on sizing in my article at the link below. This should tell you how to take the measurements of both chest and peacoat.